<html>
<head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
    <style type="text/css">
        body {
            margin: 0px auto;
        }

        #content {
            position: absolute;
            left: 50%;
            top: 35%;
            transform: translate(-50%, -50%);
        }
    </style>
    <title></title>
</head>
<body>
<div id="content">
    这是一个html页面
</div>
</body>
</html>